Senior Full-Stack Engineer — AI-Powered Energy Platform

Sitemark; Vlaams-Brabant; Hybrid; EUR 80,000 - 110,000; Full time

Benefits offered by this job

Hybrid work model

Fringe benefits

Two days in Leuven office

Job summary

Sitemark in Leuven, Belgium, is seeking a Senior Full-Stack Engineer to own features end-to-end—from spec through production and validation. You will collaborate with customers, shape the product, and contribute to architecture in a fast-paced, AI-driven environment.

You’ll work with modern JavaScript/TypeScript, React, Node.js, and cloud platforms, delivering scalable solutions that accelerate renewable energy projects while staying close to users and outcomes.

Qualifications

• Strong fluency in modern JavaScript/TypeScript with React and Node.js.
• Solid understanding of full stack development and cloud infrastructure.
• Write clean, maintainable, scalable code with strong testing and architecture skills.
• Product-minded thinker with user-focused outcomes.

Responsibilities

• Lead features end-to-end from spec to production and validation.
• Shape product direction with input from customers and stakeholders.
• Collaborate on architecture and systems design for scalable solutions.
• Build with AI tools to enhance coding efficiency without sacrificing understanding.
• Share knowledge and help the team improve daily.
• Communicate clearly with customers and internal teams.

Skills

JavaScript/TypeScript

React

Node.js

Cloud infra

PostgreSQL

Azure

AWS

Docker

Code quality

Tools

Claude Code

Cursor

Job description

Sitemark in Leuven, Belgium, is seeking a Senior Full-Stack Engineer to own features end-to-end—from spec through production and validation. You will collaborate with customers, shape the product, and contribute to architecture in a fast-paced, AI-driven environment.

You’ll work with modern JavaScript/TypeScript, React, Node.js, and cloud platforms, delivering scalable solutions that accelerate renewable energy projects while staying close to users and outcomes.